KONKA iQ440 Replacement Battery 3.7V 1750mAh KLB175N267

KONKA iQ440 Series — 3.7V Li-ion Replacement Battery (KLB175N267)

This is a 3.7V, 1750mAh Li-ion cell that replaces part number KLB175N267 in the KONKA iQ440, IQ4402, IQ4404, and IQ4415. It is a direct cell replacement for units where the original battery no longer holds charge or causes unexpected shutdowns. Capacity is rated at 6.48Wh.

• iQ440 series compatibility: The iQ440, IQ4402, IQ4404, and IQ4415 share the same battery bay dimensions and connector pinout. All four accept the KLB175N267 footprint — 60.70 × 54.98 × 4.87mm — so the same cell fits across the range without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the iQ440 platform. The BMS accepted the cell without error flags, and the charge IC stepped through trickle, constant-current, and constant-voltage phases as expected.
• First-cycle fast charge tip: On first use after installation, disable fast charging and complete one full discharge-to-charge cycle at standard rate. This lets the fuel gauge IC recalibrate its coulomb counter against the new cell's discharge curve before high-current charging begins on an uncalibrated cell.

Why the iQ440 reports wrong battery percentage after a cell swap

The fuel gauge IC on the iQ440 builds its percentage model from the previous cell's charge history and internal resistance data. When a new cell goes in, that learned curve no longer matches the actual cell chemistry. The IC keeps referencing the old model, so the display shows inaccurate figures — sometimes jumping several percent in seconds. One full discharge down to automatic power-off, followed by a full uninterrupted charge to 100%, resets the coulomb counter and realigns the gauge to the new cell.

Sudden shutdown at 20–30% on the replacement cell

This happens when the cell voltage drops sharply under modem or screen load — a voltage cliff the fuel gauge did not predict. The phone's protection circuit cuts power before the displayed percentage reaches zero. It is not a faulty cell; it is the gauge IC still running calibration data from the degraded original battery. Run two full discharge-charge cycles without fast charge, and the shutdowns should stop. If the phone still cuts out, check that the resting cell voltage at "30%" reads above 3.6V — anything lower points to a wiring or contact issue rather than the cell itself.